This sounds too good to be true. I don't know about other countries in Europe, but in The Netherlands it is definitely illegal to have a contractor work in employment conditions. I.e. you're not allowed to give a contractor set work hours, not allowed to specify how they work, not allowed to prevent them from outsourcing the work, etc. If you do those things, and the tax service finds out, or a "contractor" gets sick and decides to demand you pay them sick leave, you're in deep trouble.